Biochemistry of resistance in Myzus persicae and Aphis gossypii

2.50
Hdl Handle:
http://hdl.handle.net/10547/621850
Title:
Biochemistry of resistance in Myzus persicae and Aphis gossypii
Authors:
Moores, Graham David
Abstract:
The insecticide resistance mechanisms present in the aphids Myzus persicae and Aphis gossypii have been characterised and sensitive biochemical assays have been developed to monitor their presence in individual aphids. It was found that enhanced esterase activity is present in both aphid species, and that this enhanced activity results from the presence of larger amounts of the same enzyme rather than the presence of a more efficient enzyme. In Myzus persicae this mechanism alone is sufficient to confer high levels of insecticide resistance. In Aphis gossypii, it appears that the presence of insensitive acetylcholinesterase (AChE) is necessary for measurable levels of resistance to occur. During the course of this work, insensitive AChE was detected in Myzus persicae for the first time. This additional resistance mechanism, when combined with the enhanced esterase activity, was found to confer extremely high levels of tolerance against specific insecticides. This additional mechanism is rare in the UK at present but the use of sensitive assays to monitor its existence is of increasing importance. When the AChE mechanism becomes more prevalent in the UK, as it almost certainly will, new strategies for aphid control will be needed. Further examples of insensitive AChE conferring insensitivity not only to carbamates, but also to organophosphates, have also been detected in Aphis gossypii. The inter-relationships of the two mechanisms in this species have been resolved and new monitoring methods made available.
Citation:
Moores, G.D. (1997) 'Biochemistry of resistance in Myzus persicae and Aphis gossypii'. PhD thesis. University of Luton.
Publisher:
University of Bedfordshire
Issue Date:
Nov-1997
URI:
http://hdl.handle.net/10547/621850
Type:
Thesis or dissertation
Language:
en
Description:
A thesis submitted for the degree of Doctor of Philosophy University of Luton
Appears in Collections:
PhD e-theses

Full metadata record

DC FieldValue Language
dc.contributor.authorMoores, Graham Daviden
dc.date.accessioned2016-12-01T09:47:29Z-
dc.date.available2016-12-01T09:47:29Z-
dc.date.issued1997-11-
dc.identifier.citationMoores, G.D. (1997) 'Biochemistry of resistance in Myzus persicae and Aphis gossypii'. PhD thesis. University of Luton.en
dc.identifier.urihttp://hdl.handle.net/10547/621850-
dc.descriptionA thesis submitted for the degree of Doctor of Philosophy University of Lutonen
dc.description.abstractThe insecticide resistance mechanisms present in the aphids Myzus persicae and Aphis gossypii have been characterised and sensitive biochemical assays have been developed to monitor their presence in individual aphids. It was found that enhanced esterase activity is present in both aphid species, and that this enhanced activity results from the presence of larger amounts of the same enzyme rather than the presence of a more efficient enzyme. In Myzus persicae this mechanism alone is sufficient to confer high levels of insecticide resistance. In Aphis gossypii, it appears that the presence of insensitive acetylcholinesterase (AChE) is necessary for measurable levels of resistance to occur. During the course of this work, insensitive AChE was detected in Myzus persicae for the first time. This additional resistance mechanism, when combined with the enhanced esterase activity, was found to confer extremely high levels of tolerance against specific insecticides. This additional mechanism is rare in the UK at present but the use of sensitive assays to monitor its existence is of increasing importance. When the AChE mechanism becomes more prevalent in the UK, as it almost certainly will, new strategies for aphid control will be needed. Further examples of insensitive AChE conferring insensitivity not only to carbamates, but also to organophosphates, have also been detected in Aphis gossypii. The inter-relationships of the two mechanisms in this species have been resolved and new monitoring methods made available.en
dc.language.isoenen
dc.publisherUniversity of Bedfordshireen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectD710 Agricultural Biologyen
dc.subjectaphiden
dc.subjectaphidsen
dc.subjectMyzus persicaeen
dc.subjectAphis gossypiien
dc.subjectinsecticideen
dc.subjectresistanceen
dc.titleBiochemistry of resistance in Myzus persicae and Aphis gossypiien
dc.typeThesis or dissertationen
dc.type.qualificationnamePhDen_GB
dc.type.qualificationlevelPhDen
dc.publisher.institutionUniversity of Bedfordshireen
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